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(No Model.)

G. H.v DUTHIB.

STEAM VALVE. No. 346,435. Patented July 27, 1886.

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linnen STATES ATENT GEORGE H. DUTHIE, OF MUSKEGON, MICHIGAN, ASSIGNOR OFONE-HALF TO VILLTAM XV. BAROUS, OF SAME PLACE.

STEAM-VALVE.

' ICEICATION forming part of Letters Patent No. 346,435, dated July 2'7,1866.

A pplicalon filed May E, 1886.

T all whom zit may con/cern,.-

Be it known that l, GEORGE H. DUTHIE, of Muskegon, in the county ofMuskegon and State of Michigan, have invented certain new and usefulImprovementsin E t ani-Valves;and I do hereby declare that thelfollowing is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it appertains tomake and use the saine,

1o reference beinghad to the accompanying drawings, and to letters ofreference marked thereon, which form a part of this specilication.

My invention relates to an oscillating valve for steam-engines, and theimprovements therein are of such a nature that, first, it is perfectlybalanced in its action; second, supplies the steam to the cylinder sothat its force upon the piston is gradual from the beginning to the endof the stroke thereof; third, ex-

2o hausts so that a cushion is formed in front of said piston, thereactionary force of which greatly aids the return-stroke, and, fourth,when the valve becomes worn, it can be snugly fitted or adjusted in itsscat.

2 5 In the drawings, Figures l, 3, and 4 are transverse verticalsections showing the valve of my invention in different positions, andFi 0'. 2 is a longitudinal vertical section of the same.

Reference being had to the drawings and 3o letters of reference markedthereon, A represents the valve having lateral basal flanges, by meansof which it is bolted to the pistoneylinder. It has a cylindrical bore,and the upper half of the shell is made hollow,

3 5 so as to form a chamber, a, for the fresh live steam, which issupplied thereto from a snitable source, through the opening b. Thischamber a is provided with openings b into the core or innercircumference of the valve-cylinder,

4o near the ends thereof.

Fitting snugly within the core of the valvecylinder is the sleeve B,which is of a length corresponding to the distance between theoutlet-openings b b, and which is placed in position between said openings. The exterior' of the sleeve is cylindrical; but the interior boretapers from a less to a greater diameter as it approaches the actuatingdevices of the valve, as shown. 'This sleeve is adjustable 5olongitudinally by means of setscrews B B,

Serial No. 201,531.

(No model.)

passing through holes in the head ol said valve-cylimler, suitablytapped and located with reference to the end edges of said sleeve B.

C represents the valve, having its exterior' surface the obverse of theinner surface of the sleeve Bdnamely, tapering-and having a longitudinalsunken concave surface with a longitudinal central bridge, c, whoseouter surface is on the peripheral line ot' said valve, which forms auexhaust-chamber, D, having 6o two exhaust-openings, d Z-that is, anopening on either' side of said bridge, as shown. ln the shell ofthevalve C, ou either side ol' said exhaust-chamber D, at suitable andequal distance, are the steam-ports e c. Diametrieally 55 opposite thesesteam-openings c care auxiliary ports f f.

In the sleeve and cylinder, on a vertical line intersecting the centerofthe valve, and of a width a little less than that of the bridge e, isthe exhaust-port E, and on either side of the exhaust-port, about adistance corresponding to the width of the exhaust-openings d, are thesteam-passages F. Opening into and leading from the'valveseat-. c.,theinner cireum- 75 .ference of the sleeve--at a point in the sides ofsaid valve-seat a distance from'the steamports corresponding to thatbetween steamport openings fand e, are the auxiliary steampassages f/ g,as shown in the drawings.

The valve is mounted on a suitable shaft, G, which is journaled insuitable bearings and packed in the ends or heads of the valve-cylinder,and has a crank or arm secured to or near its outer end, through mediumof which it is oscillated.

The Valve itself is of a length corresponding to about that of thesleeve B-viz, of a length corresponding to the distance betweensteamopenings b b from chamber cand is secured 9@ in such position onthe shaft as to come between said openings L', so that the steam issuingfrom the latter can freely enter the open ends and circulate in theinterior of the valve.

The operation of my invention is substan` tially as follows: Then thevalve is in the po` sition shown in Fig. l, the piston would be near theright-hand end ofthe piston-cylinder.

The exhaust in the first instance is very slight. rlhen, as the valveassumes the position shown roo in Fig. 3, it gradually increases, and asgrad- Bridge o greatly adds to the completeness of my invention; butitcan be dipensed with, ifdesired. Again, instead of usin g the steam-ehamA ber a with the openings b D", the steam could enter said cylinderfrom the end.

The sleeve With the tapering interior, and adjustable by means ofsetsere\vs, can be applied to a number of oscillating and rotary valves;butwhile I deem its use preferable, yet it could be dispensed with.

Vihat I claim is- 1. The combination, in an oscillating valve, with thecylinder A, having a cylindrical bore, exhaust-port F, andsteam-passages F, of a sleeve, B, having .its bore tapering from one endto the other and adjustable longitudinally, and valve C, havingsteam-ports o c and exhaust-chamber D, as set forth.

2. The combination, in an oscillating-valve, With the cylinderA, havinga cylindrical bore, exhaust-port E, and steam-passages F and auxiliarypassages g y, of sleeve D, having its cone tapering and adjustedlongitudinally, an d valve C, having ports e c and fj' and exhaustchamber D.

3. The combination, in an oscillating valve, with the cylinder A, havingan exhaust-port,E, steam-passages F F, and auxiliary passages g y, ofvalve G, having steam-ports e e andff and exhaust-chamber D.

4. The combination, in an oscillating valve, with the cylinder A, havinga steamehamber, a, supplied from a suitable source, outletopenings b b,exhaust-port E, and steam-passages f/ g, oi' a valve, C, havingsteamports e e and ff and exhaust-chamber D.

5. rlhe combination, in an oscillating valve, with the cylinder havingexhaust-port E and steam-passages F, of a valve, C, having'steamportscc,exhaustchamber D, and longitudinal central bridge, c.

6. In an oscillatingstcanrvalve, the combination, with a cylinder, A,having an exhaustport, E, and steamvpassagcs F and g, of valve C, havingsteam-ports c e and fp/,exhaustehamber D, and longitudinal centralbridge, e.

7. In an oscillating steaxn-valve, the combination, with a cylinder, A,having a steamchamber, a, supplied from suitable source, outlet-openingsb b, and exhaust-port E, steampassages F, and auxiliary steam-passages g0, of valve C, having steam-ports c e and ff, exhaustchamber I), andlongitudinal central bridge, o. I v

In testimony that I claim the foregoing as my own I hereunto affix mysignature in presence of two witnesses.

GEORGE II. DUTHIE.

IVitnesses:

.Mains H. CoYNin, FRANK D. THoMAsoN.

